Parametric studies of welding distortion in fillet welded structure based on FEA using iterative substructure method

摘要

Using an in house finite element (FE) code developed based on the idea of iterative substructure method (ISM), this paper presents a numerical study to evaluate the effects of welding sequence, fixture condition and prestrain on the residual welding distortion in a fillet welded structure. The results show that welding sequence has appreciable influence on residual distortion, appropriate fixture can greatly reduce angular distortion in the workpiece and application of prestrain can significantly reduce the residual distortion. Taking advantage of the high efficiency of ISM, the optimum scheme of prestrain has been numerically predicted within practical time based on a systematic investigation.